US20190053891A1 - Intraocular lens having an asymmetric hinged closed-loop haptic structure - Google Patents
Intraocular lens having an asymmetric hinged closed-loop haptic structure Download PDFInfo
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- US20190053891A1 US20190053891A1 US16/059,735 US201816059735A US2019053891A1 US 20190053891 A1 US20190053891 A1 US 20190053891A1 US 201816059735 A US201816059735 A US 201816059735A US 2019053891 A1 US2019053891 A1 US 2019053891A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2/1613—Intraocular lenses having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2/1662—Instruments for inserting intraocular lenses into the eye
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2002/1681—Intraocular lenses having supporting structure for lens, e.g. haptics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2002/1681—Intraocular lenses having supporting structure for lens, e.g. haptics
- A61F2002/1683—Intraocular lenses having supporting structure for lens, e.g. haptics having filiform haptics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2002/1681—Intraocular lenses having supporting structure for lens, e.g. haptics
- A61F2002/1683—Intraocular lenses having supporting structure for lens, e.g. haptics having filiform haptics
- A61F2002/1686—Securing a filiform haptic to a lens body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2002/1681—Intraocular lenses having supporting structure for lens, e.g. haptics
- A61F2002/16901—Supporting structure conforms to shape of capsular bag
Definitions
- the present disclosure relates generally ophthalmic lenses and, more particularly, to intraocular lenses having asymmetric hinged closed-loop haptic structures.
- Intraocular lenses may be implanted in patients' eyes to replace a patient's natural lens.
- An IOL typically includes (1) an optic that corrects the patient's vision (e.g., typically via refraction or diffraction), and (2) haptics that constitute support structures that hold the optic in place within the patient's eye (e.g., within capsular bag).
- a physician selects an IOL for which the optic has the appropriate corrective characteristics for the patient.
- the surgeon implants selected IOL by making an incision in the capsular bag of the patient's eye (a capsulorhexis) and inserting the IOL through the incision.
- the IOL is folded for insertion into the capsular bag via a corneal incision and unfolded once in place within the capsular bag.
- the haptics may expand such that a small section of each bears on the capsular bag, retaining the IOL in place.
- existing IOLs may function acceptably well in many patients, they also have certain shortcomings.
- existing IOL design may include haptics that cause striae, or folds, in the posterior capsular bag. Such striae may result from the haptics having a relatively small angle of contact with the capsular bag. Because striae may negatively impact patient outcomes (e.g., by resulting in increased posterior capsular opacification (PCO) by providing a mechanism for the growth and/or migration of cells), haptic designs that reduce striae are desirable.
- PCO posterior capsular opacification
- such designs should also have a volume and foldability conducive to maintaining acceptably small incision sizes (e.g., 3 mm or less) as larger incision may adversely affect the patient's recovery.
- An ophthalmic device includes an optic having an optic axis and a closed-loop haptic structure coupled with the optic.
- the closed loop haptic structure includes a first hinge having a first section, a second section, and a connecting section extending between the first section and the second section.
- the first section has a first component extending in a first angular direction and a second component extending in a second angular direction that is opposite to the first angular direction.
- the closed loop haptic structure further includes a second hinge including a radial section and an axial section extending from the axial section in the first angular direction, the radial section having a cross-sectional area greater than a maximum cross-sectional area of the first hinge.
- the closed-loop haptic structure may result in fewer striae and reduced PCO. Consequently, performance of the ophthalmic device may be improved.
- FIGS. 1A-1E depict various views of an exemplary embodiment of an ophthalmic device having an asymmetric hinged closed-loop haptic structure
- FIG. 2 depicts another exemplary embodiment of an ophthalmic device having an asymmetric hinged closed-loop haptic structure
- FIG. 3 depicts another exemplary embodiment of an ophthalmic device having an asymmetric hinged closed-loop haptic structure.
- the exemplary embodiments relate to ophthalmic devices such as intraocular lenses (IOLs).
- IOLs intraocular lenses
- the following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements.
- Phrases such as “exemplary embodiment”, “one embodiment” and “another embodiment” may refer to the same or different embodiments as well as to multiple embodiments.
- the embodiments will be described with respect to systems and/or devices having certain components. However, the systems and/or devices may include more or less components than those shown, and variations in the arrangement and type of the components may be made without departing from the scope of the invention.
- the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features described herein.
- the present disclosure relates to an ophthalmic device having an optic including an optic axis and a closed-loop haptic structure coupled with the optic.
- the closed loop haptic structure includes a first hinge having a first section, a second section, and a connecting section extending between the first section and the second section.
- the first section has a first component extending in a first angular direction and a second component extending in a second angular direction that is opposite to the first angular direction.
- the closed loop haptic structure further includes a second hinge including a radial section and an axial section extending from the axial section in the first angular direction, the radial section having a cross-sectional area greater than a maximum cross-sectional area of the first hinge.
- FIGS. 1A-1E depict various views of an exemplary embodiment of an ophthalmic device 100 A having an optic 110 and a closed-loop haptic structure 120 A.
- the ophthalmic device 100 A is also referred to as an IOL 100 A.
- FIG. 1A depicts a plan view of the IOL 100 A
- FIG. 1B depicts a side view of the IOL 100 A
- FIGS. 1C and D depict plan views of portions of the IOL 100 A.
- FIG. 1E depicts a plan view of the IOL 100 A under the influence of a compressive force.
- FIGS. 1A-1E are not to scale and not all components may be shown.
- the optic 110 is an ophthalmic lens 110 that may be used to correct a patient's vision.
- the optic may be a refractive and/or diffractive lens.
- the optic 110 may be a monofocal lens, multifocal lens, a toric lens and/or another type of lens.
- the anterior and/or posterior surface of the optic 110 may thus have features including but not limited to a base curvature and diffraction grating(s).
- the optic 110 may refract and/or diffract light to correct the patient's vision.
- the optic 110 has an optic axis 112 that is out of the plane of the page in FIG. 1A .
- the optic 110 is depicted as having a circular footprint in the plan view of FIG. 1A .
- the optic 110 may have a differently shaped footprint. In some embodiments, the optic 110 may also include other features that are not shown for clarity.
- the optic 110 may be formed of one or more of a variety of flexible optical materials.
- the optic 110 may include but is not limited to one or more of silicone, a hydrogel and an acrylic such as AcrySof®.
- the closed-loop haptic structure 120 A is a support structure used to hold the ophthalmic device 100 A in place in the capsular bag of a patient's eye (not explicitly shown). In some embodiments, the closed-loop haptic structure 120 A is formed of the same material as the optic 110 .
- the closed-loop haptic structure 120 A includes an optional frame 121 and closed loops 122 A- 1 and 122 A- 2 (collectively or generically termed closed loops 122 A).
- the loops 122 A include hinges 124 A- 1 , 124 A- 2 , 126 A- 1 and 126 A- 2 .
- the hinges 124 A- 1 and 124 A- 2 (collectively or generically 124 A) have similar form and function.
- hinges 126 A- 1 and 126 A- 1 are analogous in structure and function.
- the frame 121 couples the closed-loop haptic structure haptic 120 A with the optic 110 .
- the inner portion of the frame 121 may be desired to match the shape of the optic 110 .
- the inner edge of the frame 121 shown as circular in FIG. 1A may have a different shape.
- the outer edge of the frame 121 can but need not match the inner edge.
- the closed-loop haptic structure 120 A and the optic 110 may be molded together.
- the optic 120 A and haptic may form a single monolithic structure.
- the frame 121 may be otherwise attached to the optic 110 .
- the frame 121 may be bonded to or molded around a preexisting optic 110 .
- some or all of the haptic structure 120 A may be formed of a different material than the optic 110 .
- the frame 121 is omitted.
- closed loops 122 A may be coupled directly to the optic 110 .
- the optic 110 and closed loops 122 A may be separated bonded or formed together in these embodiments.
- the closed loops 122 A- 1 and 122 A- 2 retain the IOL 100 A in position in the patient's eye by bearing on the capsular bag.
- Each loop 122 A subtends an angle, ⁇ A.
- the outer edge of the loops 122 A subtending the angle ⁇ A bear on the capsular bag.
- This angle ⁇ A may be greater than ninety degrees.
- the angle ⁇ A may be at least one hundred and twenty degrees. In some embodiments, the angle ⁇ A may be at least one hundred and thirty-five degrees. However, the angle ⁇ A is generally less than one hundred and eighty degrees.
- the loops 122 A- 1 and 122 A- 2 may subtend an angle of 2 ⁇ , which is greater than one hundred and eighty degrees.
- the loops 122 A may together subtend an angle of at least two hundred and forty degrees. Consequently, the loops 122 A contact the capsular bag over a large angle. The capsular bag may thus be extended over a larger volume.
- loops 122 A may be used in other embodiments.
- three or four loops analogous to the loops 122 A may be present. In such a case, each loop subtends a smaller angle. However, the total of the angles subtended by all the loops remains large.
- the loops 122 A shown are substantially the same and subtending the same angle. In other embodiments, different loops may subtend different angles. However, the combination of loops still subtend a large angle.
- the loops 122 A may thus stretch the capsular bag over a significantly larger region than for haptics having open arms. This may reduce striae and, therefore, PCO.
- Each of the closed loops 122 A includes two hinges 124 A and 126 A. Although two of each hinge 124 A and 126 A (one of each hinge for each loop 122 A) are shown, another number could be present in another embodiment. Further, the pair of hinges 124 A and 126 A need not be present for every loop of the haptic structure.
- the hinges 124 A are configured such that a portion of the closed loop 122 A extends radially beyond the attachment point to the frame 121 .
- the closed loops 122 A extend past the attachment point.
- a hinge 124 A may have a first section having a component that extends in one angular direction, a second section having a component that extends in the opposite angular direction, and a connecting section between the first and second sections.
- the connecting section has a bend that may be close to one hundred and eighty degrees. This bend is the portion of the loop 122 A that extends furthest past the attachment point. This may be seen in the embodiment of the hinge 124 A depicted in FIG. 1C .
- the hinge 124 A is connected to the frame 121 at or near the radial direction. However, in other embodiments, the hinge 124 A may have a small component in the clockwise (CW) direction or in the counter clockwise (CCW) direction.
- the connection the hinge 124 A/loop 122 A makes with the frame 121 may be within sixty degrees of the radial direction. In some embodiments, the connection the hinge 124 A/loop 122 A makes with the frame is within forty-five degrees of the radial direction. In some embodiments, this angle is within twenty degrees of the radial direction.
- hinge 124 A may have a first section that has component in the CW direction.
- the direction of the first section and the CW component are shown by dotted arrows.
- the first section of the hinge 124 A may have a relatively large component in the CW direction.
- the first section of the hinge 124 A is within forty-five degrees of the CW direction.
- the first section of the hinge 124 A may be within twenty degrees of the CW in some such embodiments.
- the second section of the hinge 124 A is substantially in the CCW direction, as shown by the dotted arrow at the outer edge of the loop 122 A. In some embodiments, the second section of the hinge 124 A is within twenty degrees of the CCW direction.
- a connecting section that includes a bend. This bend may be close to one hundred and eighty degrees and is sufficient such that the loop 122 A changes direction from generally CW to CCW. In other embodiments or locations, the angular directions may be reversed. For example, if the locations of the hinges 124 A and 126 A were reversed, the first section of hinge 124 A would be in the CCW direction and the second section would be in the CCW direction. In the embodiment shown, the hinge 124 A has a relatively constant width w 1 and a relatively constant thickness in a direction perpendicular to the page. In other embodiments, different portions of the hinge 124 A may have different widths and/or different thicknesses.
- hinge 126 A may be configured with two sections.
- a first section is substantially radial. This radial section connects to the frame 121 or the optic 110 if the frame 121 is omitted.
- An axial section of the hinge is in the opposite angular direction as the second section of the hinge 124 A. This is because the second section of the hinge 124 A and the axial section of the hinge 126 A are connected to form the outer edge of the loop 122 A.
- the radial section extends outwardly from the frame 121 .
- the axial section is in the CW direction and connected to the radial section through a bend that is substantially ninety degrees.
- the radial section of the hinge 126 A has a width w 2 and a thickness in a direction perpendicular to the page.
- the hinges 124 A and 126 A are asymmetric. In certain embodiments, the hinges 124 A may be more readily bent than the hinges 126 A. In the embodiment shown, this is because the cross-sectional area of the axial radial section of the hinge 126 A is larger than the cross-sectional area of the hinge 124 A. In the embodiment shown in FIGS. 1A-1E , the thickness of the loop 122 A is constant. Because the width w 2 of a portion of the hinge 126 A is greater than the width w 1 of the hinge 124 A, the hinge 126 A is more stable. In some embodiments, w 2 is at least twice w 1 . IN other embodiments, w 2 is at least thrice w 1 .
- the thickness of the hinge 126 A may be greater than the thickness of the hinge 124 A and the widths may be the same. In other embodiments, the widths and thicknesses may vary in another manner such that the hinge 126 A is more stable than the hinge 124 A. Alternatively, the hinge 126 A may include other, stiffer materials than the hinge 124 A. All of the above may be considered ways in which the cross-sectional area of the hinge 124 A and is less than the cross-sectional area of the hinge 126 A such that the hinge 126 A is stiffer than the hinge 124 A.
- FIG. 1E depicts the closed-loop haptic structure 120 A under a compressive force. Because of the hinges 124 A- 1 , 124 A- 2 , 126 A- 1 and 126 A- 2 , the compression has caused the connecting section of each hinge 124 A to bend further. The hinges 126 A have remained relatively stable. The first and second sections of the hinges 124 A are brought closer together.
- a portion of the loops 122 A- 1 and 122 A- 2 extend further past the connection of the hinge 124 A to the frame 121 than in the uncompressed state shown in FIG. 1A .
- the outer edges of the loops 122 A also move closer to the optic axis 112 .
- the haptic structure 120 A has remained substantially in-plane.
- the optic 110 has also remained substantially in-plane. Although it is possible for the optic 110 to move in the anterior or posterior direction (i.e. along the optic axis 112 ) due to the compressive force, this tendency may be mitigated by the combination of the hinges 124 A and 126 A. Thus, motion of the optic 110 and haptic structure 120 A may be more predictable.
- the closed loop haptic structure 120 A includes sharp corners. Both the loops 122 A and the frame 121 may have sharp edges. As a result, the optic 110 may be surrounded on all sides by sharp edges. These sharp edges may also reduce the probability of cells migrating to the optic 110 from any side. Again, PCO may be reduced or eliminated.
- the large angle ⁇ A allows the closed-loop haptic structure to contact a larger portion of and better extend the capsular bag. This may not only improve the axial and rotational stability of the IOL 100 A, but also reduce the formation of striae (wrinkles) in the capsular bag. The large angle of contact with the capsular bag may thus mitigate or prevent PCO. Sharp edges for the closed-loop haptic structure 120 A may further reduce PCO. Hinges 124 A- 1 , 124 A- 2 , 126 A- 1 and 126 A- 2 allow the closed-loop haptic structure 120 A to respond more predictably to compression. More specifically, the loops 122 A- 1 and 122 A- 2 and optic 110 are more likely to remain in plane in response to a compression. Damage to the patient's iris may be prevented. Thus, performance of the IOL 100 A may be further improved.
- FIG. 2 depicts another exemplary embodiment of an ophthalmic device 100 B having an optic 110 and a closed-loop haptic structure 120 B.
- the ophthalmic device 100 B is also referred to as an IOL 100 B.
- the IOL 100 B is analogous to the IOL 100 A. Consequently, analogous components have similar labels.
- the optic 110 and closed-loop haptic structure 120 B are analogous to the optic 110 and closed-loop haptic structure 120 A.
- FIG. 2 is not to scale and not all components may be shown.
- the optic 110 may be a refractive and/or diffractive lens and may be monofocal or multifocal.
- the closed-loop haptic structure 120 B includes closed loops 122 B- 1 and 122 B- 2 (collectively or generically 122 B) hinges 124 B- 1 and 124 B- 2 (collectively or generically 124 B) and hinges 126 B- 1 and 126 B- 2 (collectively or generically 126 B) that are analogous to closed loops 122 A- 1 and 122 A- 2 , hinges 124 A- 1 and 124 A- 2 , and hinges 126 A- 1 and 126 A- 2 , respectively.
- the frame is omitted.
- the loops 122 B are connected to the optic 110 .
- the frame might be included.
- the haptic structure 120 B and optic 110 may be fabricated together or formed separately and then connected.
- the closed loops 122 B retain the IOL 100 B in position in the patient's eye by bearing upon the capsular bag.
- Each of the loops 122 B subtends an angle, ⁇ B.
- the magnitude of ⁇ B is substantially the same as that for ⁇ A.
- ⁇ B may be larger than ⁇ A.
- ⁇ B may be as large as one hundred and eighty degrees.
- the hinges 124 B and 126 B are configured and function in an analogous manner to the hinges 124 A and 126 A, respectively.
- Each hinge 124 B thus includes a first section having a component in a first angular direction (e.g. CW or CCW), a second section having a component in a second angular direction (e.g. CCW or CW, respectively) and a connecting section between the first and second sections.
- a first angular direction e.g. CW or CCW
- a second section having a component in a second angular direction
- a connecting section between the first and second sections e.g. CCW or CW, respectively.
- one or more of the loops 122 B has a portion that extends past the attachment point to the optic 110 for the hinge 124 B.
- each hinge 126 B has a radial section and an axial section that are connected through a bend that is substantially ninety degrees.
- the axial section is in the angular direction that is opposite to the second section of the first hinge because these two sections meet in the loop 122 B.
- Each hinge 126 B is stiffer in at least the radial section than the hinge 124 B.
- at least the radial section of the hinge 126 B has a larger cross-sectional area, has a larger thickness, has a larger width and/or is formed of a stiffer material than the relevant portions of the hinge 124 B.
- the hinge 126 B is more stable than the hinges 122 .
- each of the closed loops 122 B is shown as including two hinges, in another embodiment, each loop 122 B may have another number of hinges 124 B and/or 126 B. Further, although two loops 122 B are shown, in another embodiment, another number of loops might be present.
- the haptic structure 120 B includes connectors 128 B- 1 and 128 B- 2 (collectively or generically 128 B).
- the connector 128 B- 1 connects the hinge 124 B- 1 to the hinge 126 B- 2 .
- the connector 128 B- 3 and 128 B- 2 connect the hinge 124 B- 1 to the hinge 126 B- 2 .
- These connectors 128 B may improve the stability of the haptic structure 120 B and help ensure that the loops 122 B remain in plane when under compression.
- the IOL 100 B may share some or all of the benefits of the IOL 100 A.
- the large angle ⁇ B allows the closed-loop haptic structure 120 B to contact a larger portion of the capsular bag. This may improve the stability of the IOL 100 B, reduce striae in the capsular bag, and mitigate or prevent PCO. Sharp edges for the closed-loop haptic structure 120 B may further reduce PCO.
- Hinges 124 B and 126 B allow the closed-loop haptic structure 120 B to respond more predictably to and be more likely to remain in plane in response to a compression. Thus, performance of the IOL 100 B may be improved.
- FIG. 3 depicts another exemplary embodiment of an ophthalmic device 100 C having an optic 110 and a closed-loop haptic structure 120 C.
- the ophthalmic device 100 C is also referred to as an IOL 100 C.
- the IOL 100 C is analogous to the IOL 100 A and/or 100 B. Consequently, analogous components have similar labels.
- the optic 110 and closed-loop haptic structure 120 C are analogous to the optic 110 and closed-loop haptic structure 120 A and 120 B.
- FIG. 3 is not to scale and not all components may be shown.
- the optic 110 may be a refractive and/or diffractive lens and may be monofocal or multifocal.
- the closed-loop haptic structure 120 C includes closed loops 122 C- 1 and 122 C- 2 (collectively or generically 122 C), hinges 126 C- 1 and 126 C- 2 (collectively or generically 126 C) that are analogous to closed loops 122 A- 1 and 122 A- 2 , hinges 126 A- 1 , 126 A- 2 , 126 B- 1 and 126 B- 2 , respectively.
- the frame is omitted.
- the loops 122 C are connected to the optic 110 .
- the frame might be included.
- the haptic structure 120 C and optic 110 may be fabricated together or formed separately and then connected.
- the closed loops 122 BC retain the IOL 100 C in position in the patient's eye by bearing upon the capsular bag.
- Each of the loops 122 C subtends an angle, ⁇ C.
- the magnitude of ⁇ C is substantially the same as that for ⁇ B.
- the hinges 126 C are configured and function in an analogous manner to the hinges 126 A and 126 B.
- Each hinge 126 C has a radial section and an axial section that are connected through a bend that is substantially ninety degrees. The axial section is in the angular direction that is opposite to the second section of the first hinge because these two sections meet in the loop 122 C.
- Each hinge 126 C is stiffer in at least the radial section than the hinge 124 A/ 124 B.
- at least the radial section of the hinge 126 C has a larger cross-sectional area, has a larger thickness, has a larger width and/or is formed of a stiffer material than the relevant portions of the hinge 124 A/ 124 B.
- each of the closed loops 122 C is shown as including two hinges, in another embodiment, each loop 122 C may have another number of hinges 124 B and/or 126 B. Further, although two loops 122 C are shown, in another embodiment, another number of loops might be present.
- the haptic structure 120 C includes connecting hinges 128 C- 1 and 128 C- 2 (collectively or generically 128 C).
- the connecting hinge 128 C- 1 connects the loop 120 C- 1 to the loop 128 C- 2 .
- the connecting hinge 128 C- 2 connects the loop 120 C- 2 to the loop 128 C- 1 .
- Connecting hinges 128 C are thus connecting hinges analogous to connectors 128 B.
- Each connecting hinge 128 C is an s-bend that connects one loop 122 C- 1 to an adjacent loop 122 C- 2 .
- the connecting hinges 128 C also bend when the loops 122 C are compressed.
- the hinges 128 C may improve the stability of the haptic structure 120 B and help ensure that the loops 122 B remain in plane when under compression. However, like the hinges 124 A and 124 B, the connecting hinges 128 C are smaller in cross-sectional area and/or stiffness than the hinges 126 C.
- the IOL 100 C may share some or all of the benefits of the IOL 100 A and/or 100 B.
- the large angle ⁇ C allows the closed-loop haptic structure 120 C to contact a larger portion of the capsular bag.
- the angle ⁇ C is approximately the same as ⁇ A and/or ⁇ B.
- ⁇ C is approximately one hundred and eighty degrees.
- the loops 120 C may maintain contact with the capsular bag substantially all the way around periphery of the optic 110 . This may improve the stability of the IOL 100 C, reduce striae in the capsular bag, and mitigate or prevent PCO. Sharp edges for the closed-loop haptic structure 120 C may further reduce PCO.
- Hinges 126 C and 128 C allow the closed-loop haptic structure 120 C to respond more predictably to and be more likely to remain in plane in response to a compression. Thus, performance of the IOL 100 C may be improved.
- IOLs 100 A, 100 B and 100 C have been described herein. One of ordinary skill in the art will recognize that one or more of these features may be combined in manners not explicitly disclosed herein and that are not inconsistent with the method and apparatus described.
Abstract
Description
- The present disclosure relates generally ophthalmic lenses and, more particularly, to intraocular lenses having asymmetric hinged closed-loop haptic structures.
- Intraocular lenses (IOLs) may be implanted in patients' eyes to replace a patient's natural lens. An IOL typically includes (1) an optic that corrects the patient's vision (e.g., typically via refraction or diffraction), and (2) haptics that constitute support structures that hold the optic in place within the patient's eye (e.g., within capsular bag). In general, a physician selects an IOL for which the optic has the appropriate corrective characteristics for the patient. During ophthalmic surgery, often performed for conditions such as cataracts, the surgeon implants selected IOL by making an incision in the capsular bag of the patient's eye (a capsulorhexis) and inserting the IOL through the incision. Typically, the IOL is folded for insertion into the capsular bag via a corneal incision and unfolded once in place within the capsular bag. During unfolding, the haptics may expand such that a small section of each bears on the capsular bag, retaining the IOL in place.
- Although existing IOLs may function acceptably well in many patients, they also have certain shortcomings. For example, existing IOL design may include haptics that cause striae, or folds, in the posterior capsular bag. Such striae may result from the haptics having a relatively small angle of contact with the capsular bag. Because striae may negatively impact patient outcomes (e.g., by resulting in increased posterior capsular opacification (PCO) by providing a mechanism for the growth and/or migration of cells), haptic designs that reduce striae are desirable. Moreover, such designs should also have a volume and foldability conducive to maintaining acceptably small incision sizes (e.g., 3 mm or less) as larger incision may adversely affect the patient's recovery.
- Accordingly, what is needed is an improved IOL that may address PCO without significantly complicating implantation.
- An ophthalmic device includes an optic having an optic axis and a closed-loop haptic structure coupled with the optic. The closed loop haptic structure includes a first hinge having a first section, a second section, and a connecting section extending between the first section and the second section. The first section has a first component extending in a first angular direction and a second component extending in a second angular direction that is opposite to the first angular direction. The closed loop haptic structure further includes a second hinge including a radial section and an axial section extending from the axial section in the first angular direction, the radial section having a cross-sectional area greater than a maximum cross-sectional area of the first hinge.
- According to the method and system disclosed herein, the closed-loop haptic structure may result in fewer striae and reduced PCO. Consequently, performance of the ophthalmic device may be improved.
- For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following description taken in conjunction with the accompanying drawings in which like reference numerals indicate like features and wherein:
-
FIGS. 1A-1E depict various views of an exemplary embodiment of an ophthalmic device having an asymmetric hinged closed-loop haptic structure; -
FIG. 2 depicts another exemplary embodiment of an ophthalmic device having an asymmetric hinged closed-loop haptic structure; and -
FIG. 3 depicts another exemplary embodiment of an ophthalmic device having an asymmetric hinged closed-loop haptic structure. - The skilled person in the art will understand that the drawings, described below, are for illustration purposes only. The drawings are not intended to limit the scope of the applicant's disclosure in any way.
- The exemplary embodiments relate to ophthalmic devices such as intraocular lenses (IOLs). The following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements. Various modifications to the exemplary embodiments and the generic principles and features described herein will be readily apparent. Phrases such as “exemplary embodiment”, “one embodiment” and “another embodiment” may refer to the same or different embodiments as well as to multiple embodiments. The embodiments will be described with respect to systems and/or devices having certain components. However, the systems and/or devices may include more or less components than those shown, and variations in the arrangement and type of the components may be made without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features described herein.
- In general, the present disclosure relates to an ophthalmic device having an optic including an optic axis and a closed-loop haptic structure coupled with the optic. The closed loop haptic structure includes a first hinge having a first section, a second section, and a connecting section extending between the first section and the second section. The first section has a first component extending in a first angular direction and a second component extending in a second angular direction that is opposite to the first angular direction. The closed loop haptic structure further includes a second hinge including a radial section and an axial section extending from the axial section in the first angular direction, the radial section having a cross-sectional area greater than a maximum cross-sectional area of the first hinge.
-
FIGS. 1A-1E depict various views of an exemplary embodiment of anophthalmic device 100A having an optic 110 and a closed-loophaptic structure 120A. For simplicity, theophthalmic device 100A is also referred to as an IOL 100A.FIG. 1A depicts a plan view of the IOL 100A, whileFIG. 1B depicts a side view of the IOL 100A.FIGS. 1C and D depict plan views of portions of theIOL 100A.FIG. 1E depicts a plan view of the IOL 100A under the influence of a compressive force. For clarity,FIGS. 1A-1E are not to scale and not all components may be shown. - The optic 110 is an
ophthalmic lens 110 that may be used to correct a patient's vision. For example, the optic may be a refractive and/or diffractive lens. The optic 110 may be a monofocal lens, multifocal lens, a toric lens and/or another type of lens. The anterior and/or posterior surface of the optic 110 may thus have features including but not limited to a base curvature and diffraction grating(s). The optic 110 may refract and/or diffract light to correct the patient's vision. The optic 110 has anoptic axis 112 that is out of the plane of the page inFIG. 1A . The optic 110 is depicted as having a circular footprint in the plan view ofFIG. 1A . In other embodiments, the optic 110 may have a differently shaped footprint. In some embodiments, the optic 110 may also include other features that are not shown for clarity. The optic 110 may be formed of one or more of a variety of flexible optical materials. For example, the optic 110 may include but is not limited to one or more of silicone, a hydrogel and an acrylic such as AcrySof®. - The closed-loop
haptic structure 120A is a support structure used to hold theophthalmic device 100A in place in the capsular bag of a patient's eye (not explicitly shown). In some embodiments, the closed-loophaptic structure 120A is formed of the same material as theoptic 110. The closed-loophaptic structure 120A includes anoptional frame 121 andclosed loops 122A-1 and 122A-2 (collectively or generically termedclosed loops 122A). Theloops 122A include hinges 124A-1, 124A-2, 126A-1 and 126A-2. Thehinges 124A-1 and 124A-2 (collectively or generically 124A) have similar form and function. Similarly, hinges 126A-1 and 126A-1 (collectively or generically 126A) are analogous in structure and function. - The
frame 121 couples the closed-loop haptic structure haptic 120A with the optic 110. The inner portion of theframe 121 may be desired to match the shape of the optic 110. Thus, the inner edge of theframe 121 shown as circular inFIG. 1A may have a different shape. The outer edge of theframe 121 can but need not match the inner edge. In some embodiments, the closed-loophaptic structure 120A and the optic 110 may be molded together. Thus, theoptic 120A and haptic may form a single monolithic structure. In other embodiments, theframe 121 may be otherwise attached to theoptic 110. For example, theframe 121 may be bonded to or molded around apreexisting optic 110. In some such embodiments, some or all of thehaptic structure 120A may be formed of a different material than the optic 110. In some embodiments, theframe 121 is omitted. In such embodiments, closedloops 122A may be coupled directly to theoptic 110. The optic 110 andclosed loops 122A may be separated bonded or formed together in these embodiments. - The
closed loops 122A-1 and 122A-2 retain theIOL 100A in position in the patient's eye by bearing on the capsular bag. Eachloop 122A subtends an angle, φA. The outer edge of theloops 122A subtending the angle φA bear on the capsular bag. This angle φA may be greater than ninety degrees. For example, the angle φA may be at least one hundred and twenty degrees. In some embodiments, the angle φA may be at least one hundred and thirty-five degrees. However, the angle φA is generally less than one hundred and eighty degrees. Together theloops 122A-1 and 122A-2 may subtend an angle of 2φ, which is greater than one hundred and eighty degrees. In some embodiments, theloops 122A may together subtend an angle of at least two hundred and forty degrees. Consequently, theloops 122A contact the capsular bag over a large angle. The capsular bag may thus be extended over a larger volume. - Although two
loops 122A are shown inFIG. 1A , more loops may be used in other embodiments. For example, three or four loops analogous to theloops 122A may be present. In such a case, each loop subtends a smaller angle. However, the total of the angles subtended by all the loops remains large. Theloops 122A shown are substantially the same and subtending the same angle. In other embodiments, different loops may subtend different angles. However, the combination of loops still subtend a large angle. Theloops 122A may thus stretch the capsular bag over a significantly larger region than for haptics having open arms. This may reduce striae and, therefore, PCO. - Each of the
closed loops 122A includes twohinges hinge loop 122A) are shown, another number could be present in another embodiment. Further, the pair ofhinges - The hinges 124A are configured such that a portion of the
closed loop 122A extends radially beyond the attachment point to theframe 121. In the embodiment shown inFIGS. 1A and 1C , theclosed loops 122A extend past the attachment point. Thus, ahinge 124A may have a first section having a component that extends in one angular direction, a second section having a component that extends in the opposite angular direction, and a connecting section between the first and second sections. The connecting section has a bend that may be close to one hundred and eighty degrees. This bend is the portion of theloop 122A that extends furthest past the attachment point. This may be seen in the embodiment of thehinge 124A depicted inFIG. 1C . Thehinge 124A is connected to theframe 121 at or near the radial direction. However, in other embodiments, thehinge 124A may have a small component in the clockwise (CW) direction or in the counter clockwise (CCW) direction. The connection thehinge 124A/loop 122A makes with theframe 121 may be within sixty degrees of the radial direction. In some embodiments, the connection thehinge 124A/loop 122A makes with the frame is within forty-five degrees of the radial direction. In some embodiments, this angle is within twenty degrees of the radial direction. - As illustrated by
FIG. 1C , hinge 124A may have a first section that has component in the CW direction. The direction of the first section and the CW component are shown by dotted arrows. As depicted inFIG. 1C , the first section of thehinge 124A may have a relatively large component in the CW direction. In some embodiments, the first section of thehinge 124A is within forty-five degrees of the CW direction. The first section of thehinge 124A may be within twenty degrees of the CW in some such embodiments. The second section of thehinge 124A is substantially in the CCW direction, as shown by the dotted arrow at the outer edge of theloop 122A. In some embodiments, the second section of thehinge 124A is within twenty degrees of the CCW direction. Between the first and second sections is a connecting section that includes a bend. This bend may be close to one hundred and eighty degrees and is sufficient such that theloop 122A changes direction from generally CW to CCW. In other embodiments or locations, the angular directions may be reversed. For example, if the locations of thehinges hinge 124A would be in the CCW direction and the second section would be in the CCW direction. In the embodiment shown, thehinge 124A has a relatively constant width w1 and a relatively constant thickness in a direction perpendicular to the page. In other embodiments, different portions of thehinge 124A may have different widths and/or different thicknesses. - As illustrated by
FIG. 1D , hinge 126A may be configured with two sections. A first section is substantially radial. This radial section connects to theframe 121 or the optic 110 if theframe 121 is omitted. An axial section of the hinge is in the opposite angular direction as the second section of thehinge 124A. This is because the second section of thehinge 124A and the axial section of thehinge 126A are connected to form the outer edge of theloop 122A. The radial section extends outwardly from theframe 121. The axial section is in the CW direction and connected to the radial section through a bend that is substantially ninety degrees. The radial section of thehinge 126A has a width w2 and a thickness in a direction perpendicular to the page. - The
hinges hinges 124A may be more readily bent than thehinges 126A. In the embodiment shown, this is because the cross-sectional area of the axial radial section of thehinge 126A is larger than the cross-sectional area of thehinge 124A. In the embodiment shown inFIGS. 1A-1E , the thickness of theloop 122A is constant. Because the width w2 of a portion of thehinge 126A is greater than the width w1 of thehinge 124A, thehinge 126A is more stable. In some embodiments, w2 is at least twice w1. IN other embodiments, w2 is at least thrice w1. In other embodiments, the thickness of thehinge 126A may be greater than the thickness of thehinge 124A and the widths may be the same. In other embodiments, the widths and thicknesses may vary in another manner such that thehinge 126A is more stable than thehinge 124A. Alternatively, thehinge 126A may include other, stiffer materials than thehinge 124A. All of the above may be considered ways in which the cross-sectional area of thehinge 124A and is less than the cross-sectional area of thehinge 126A such that thehinge 126A is stiffer than thehinge 124A. - Because the
hinges loops 122A are more likely to stay in-plane when compressed. The hinges 124A and hinges 126A are configured such that the closed-loophaptic structure 120A may be compressed without significant motion in the anterior or posterior direction.FIG. 1E depicts the closed-loophaptic structure 120A under a compressive force. Because of thehinges 124A-1, 124A-2, 126A-1 and 126A-2, the compression has caused the connecting section of eachhinge 124A to bend further. The hinges 126A have remained relatively stable. The first and second sections of thehinges 124A are brought closer together. As a result, a portion of theloops 122A-1 and 122A-2 extend further past the connection of thehinge 124A to theframe 121 than in the uncompressed state shown inFIG. 1A . The outer edges of theloops 122A also move closer to theoptic axis 112. However, thehaptic structure 120A has remained substantially in-plane. The optic 110 has also remained substantially in-plane. Although it is possible for the optic 110 to move in the anterior or posterior direction (i.e. along the optic axis 112) due to the compressive force, this tendency may be mitigated by the combination of thehinges haptic structure 120A may be more predictable. - As can also be seen in
FIG. 1B , the closed loophaptic structure 120A includes sharp corners. Both theloops 122A and theframe 121 may have sharp edges. As a result, the optic 110 may be surrounded on all sides by sharp edges. These sharp edges may also reduce the probability of cells migrating to the optic 110 from any side. Again, PCO may be reduced or eliminated. - Use of the
IOL 100A may improve patient outcomes. The large angle φA allows the closed-loop haptic structure to contact a larger portion of and better extend the capsular bag. This may not only improve the axial and rotational stability of theIOL 100A, but also reduce the formation of striae (wrinkles) in the capsular bag. The large angle of contact with the capsular bag may thus mitigate or prevent PCO. Sharp edges for the closed-loophaptic structure 120A may further reduce PCO. Hinges 124A-1, 124A-2, 126A-1 and 126A-2 allow the closed-loophaptic structure 120A to respond more predictably to compression. More specifically, theloops 122A-1 and 122A-2 andoptic 110 are more likely to remain in plane in response to a compression. Damage to the patient's iris may be prevented. Thus, performance of theIOL 100A may be further improved. -
FIG. 2 depicts another exemplary embodiment of anophthalmic device 100B having an optic 110 and a closed-loophaptic structure 120B. For simplicity, theophthalmic device 100B is also referred to as anIOL 100B. TheIOL 100B is analogous to theIOL 100A. Consequently, analogous components have similar labels. Thus, the optic 110 and closed-loophaptic structure 120B are analogous to the optic 110 and closed-loophaptic structure 120A. For clarity,FIG. 2 is not to scale and not all components may be shown. - The optic 110 may be a refractive and/or diffractive lens and may be monofocal or multifocal. The closed-loop
haptic structure 120B includesclosed loops 122B-1 and 122B-2 (collectively or generically 122B) hinges 124B-1 and 124B-2 (collectively or generically 124B) and hinges 126B-1 and 126B-2 (collectively or generically 126B) that are analogous toclosed loops 122A-1 and 122A-2, hinges 124A-1 and 124A-2, and hinges 126A-1 and 126A-2, respectively. In the embodiment shown inFIG. 2 , the frame is omitted. Thus, theloops 122B are connected to theoptic 110. However, in other embodiments, the frame might be included. Thehaptic structure 120B and optic 110 may be fabricated together or formed separately and then connected. - The
closed loops 122B retain theIOL 100B in position in the patient's eye by bearing upon the capsular bag. Each of theloops 122B subtends an angle, φB. In some embodiments, the magnitude of φB is substantially the same as that for φA. In other embodiments, φB may be larger than φA. For example, φB may be as large as one hundred and eighty degrees. - The hinges 124B and 126B are configured and function in an analogous manner to the
hinges hinge 124B thus includes a first section having a component in a first angular direction (e.g. CW or CCW), a second section having a component in a second angular direction (e.g. CCW or CW, respectively) and a connecting section between the first and second sections. As a result, one or more of theloops 122B has a portion that extends past the attachment point to the optic 110 for thehinge 124B. Similarly, eachhinge 126B has a radial section and an axial section that are connected through a bend that is substantially ninety degrees. The axial section is in the angular direction that is opposite to the second section of the first hinge because these two sections meet in theloop 122B. Eachhinge 126B is stiffer in at least the radial section than thehinge 124B. For example, at least the radial section of thehinge 126B has a larger cross-sectional area, has a larger thickness, has a larger width and/or is formed of a stiffer material than the relevant portions of thehinge 124B. As a result, thehinge 126B is more stable than the hinges 122. Although each of theclosed loops 122B is shown as including two hinges, in another embodiment, eachloop 122B may have another number ofhinges 124B and/or 126B. Further, although twoloops 122B are shown, in another embodiment, another number of loops might be present. - In addition, the
haptic structure 120B includesconnectors 128B-1 and 128B-2 (collectively or generically 128B). Theconnector 128B-1 connects thehinge 124B-1 to thehinge 126B-2. Theconnector 128B-3 and 128B-2 connect thehinge 124B-1 to thehinge 126B-2. Theseconnectors 128B may improve the stability of thehaptic structure 120B and help ensure that theloops 122B remain in plane when under compression. - The
IOL 100B may share some or all of the benefits of theIOL 100A. The large angle φB allows the closed-loophaptic structure 120B to contact a larger portion of the capsular bag. This may improve the stability of theIOL 100B, reduce striae in the capsular bag, and mitigate or prevent PCO. Sharp edges for the closed-loophaptic structure 120B may further reduce PCO.Hinges haptic structure 120B to respond more predictably to and be more likely to remain in plane in response to a compression. Thus, performance of theIOL 100B may be improved. -
FIG. 3 depicts another exemplary embodiment of anophthalmic device 100C having an optic 110 and a closed-loophaptic structure 120C. For simplicity, theophthalmic device 100C is also referred to as anIOL 100C. TheIOL 100C is analogous to theIOL 100A and/or 100B. Consequently, analogous components have similar labels. Thus, the optic 110 and closed-loophaptic structure 120C are analogous to the optic 110 and closed-loophaptic structure FIG. 3 is not to scale and not all components may be shown. - The optic 110 may be a refractive and/or diffractive lens and may be monofocal or multifocal. The closed-loop
haptic structure 120C includesclosed loops 122C-1 and 122C-2 (collectively or generically 122C), hinges 126C-1 and 126C-2 (collectively or generically 126C) that are analogous toclosed loops 122A-1 and 122A-2, hinges 126A-1, 126A-2, 126B-1 and 126B-2, respectively. In the embodiment shown inFIG. 3 , the frame is omitted. Thus, theloops 122C are connected to theoptic 110. However, in other embodiments, the frame might be included. Thehaptic structure 120C and optic 110 may be fabricated together or formed separately and then connected. - The closed loops 122BC retain the
IOL 100C in position in the patient's eye by bearing upon the capsular bag. Each of theloops 122C subtends an angle, φC. In some embodiments, the magnitude of φC is substantially the same as that for φB. - The hinges 126C are configured and function in an analogous manner to the
hinges hinge 126C has a radial section and an axial section that are connected through a bend that is substantially ninety degrees. The axial section is in the angular direction that is opposite to the second section of the first hinge because these two sections meet in theloop 122C. Eachhinge 126C is stiffer in at least the radial section than thehinge 124A/124B. For example, at least the radial section of thehinge 126C has a larger cross-sectional area, has a larger thickness, has a larger width and/or is formed of a stiffer material than the relevant portions of thehinge 124A/124B. As a result, thehinge 126C is more stable than the hinges 124. Although each of theclosed loops 122C is shown as including two hinges, in another embodiment, eachloop 122C may have another number ofhinges 124B and/or 126B. Further, although twoloops 122C are shown, in another embodiment, another number of loops might be present. - In addition, the
haptic structure 120C includes connectinghinges 128C-1 and 128C-2 (collectively or generically 128C). The connectinghinge 128C-1 connects theloop 120C-1 to theloop 128C-2. Similarly, the connectinghinge 128C-2 connects theloop 120C-2 to theloop 128C-1. Connecting hinges 128C are thus connecting hinges analogous toconnectors 128B. Each connectinghinge 128C is an s-bend that connects oneloop 122C-1 to anadjacent loop 122C-2. The connecting hinges 128C also bend when theloops 122C are compressed. The hinges 128C may improve the stability of thehaptic structure 120B and help ensure that theloops 122B remain in plane when under compression. However, like thehinges hinges 126C. - The
IOL 100C may share some or all of the benefits of theIOL 100A and/or 100B. The large angle φC allows the closed-loophaptic structure 120C to contact a larger portion of the capsular bag. In some embodiments, the angle φC is approximately the same as φA and/or φB. In some embodiments, φC is approximately one hundred and eighty degrees. Thus, theloops 120C may maintain contact with the capsular bag substantially all the way around periphery of the optic 110. This may improve the stability of theIOL 100C, reduce striae in the capsular bag, and mitigate or prevent PCO. Sharp edges for the closed-loophaptic structure 120C may further reduce PCO.Hinges haptic structure 120C to respond more predictably to and be more likely to remain in plane in response to a compression. Thus, performance of theIOL 100C may be improved. - Various features of the
IOLs - It will be appreciated that various of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different devices or applications. It will also be appreciated that various presently unforeseen or unanticipated alternatives, modifications, variations or improvements therein may be subsequently made by those skilled in the art which alternatives, variations and improvements are also intended to be encompassed by the following claims.
Claims (7)
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US20080109077A1 (en) * | 2004-04-06 | 2008-05-08 | Xcelens S.A. | Intraocular Lens |
US20110282441A1 (en) * | 2007-07-05 | 2011-11-17 | Abbott Medical Optics Inc. | Intraocular lens with post-implantation adjustment capabilities |
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US11471271B2 (en) | 2022-10-18 |
US10912642B2 (en) | 2021-02-09 |
US20210121285A1 (en) | 2021-04-29 |
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